Internet protocol multicast on passive optical networks

a technology of optical network and network protocol, applied in the field of internet protocol multicast on passive optical network, can solve the problems of reducing the effectiveness of such as streaming video, and inefficient for some types of media distribution

Active Publication Date: 2011-09-29
VERIZON PATENT & LICENSING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While this model is effective for on-demand content-related activity, such as web browsing, it is inefficient for some types of media distributions, such as streaming video for IP television, distance learning, etc.
Unfortunately, implemen...

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  • Internet protocol multicast on passive optical networks
  • Internet protocol multicast on passive optical networks
  • Internet protocol multicast on passive optical networks

Examples

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Embodiment Construction

[0011]The following detailed description of exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements. Also, the following detailed description does not limit the invention.

[0012]Implementations described herein provide for IP multicast on ATM-based PON systems without requiring the increased cost and latency introduced by segmentation and reassembly (SAR) of ATM cells and IGMP snooping processing. In one embodiment, an IP router upstream from the PON, upon receipt of an IGMP join (or leave) request message, captures address information associated with a requesting client. Logic on the IP router transmits (e.g., via a communication / control channel) the captured address information to the optical line terminal (OLT) to populate (or modify) one or more multicast state tables in the OLT, thereby indicating where multicast traffic is to be delivered.

[0013]Subsequently, the OLT may identify addres...

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Abstract

A method for implementing multicast via a passive optical network (PON) may include receiving Internet group multicast protocol (IGMP) messages from a customer device. Multicast information associated with the IGMP messages is identified, wherein the multicast information includes at least multicast group information and customer identification information. The multicast information is stored in a multicast state table. Downstream layer 2 traffic is received and multicast addressing information is extracted from the layer 2 traffic. It is then determined whether the multicast addressing information matches the multicast group information stored in the multicast state table. The layer 2 traffic is forwarded on at least one PON interface corresponding to the customer identification information that is associated with the stored multicast group information when the multicast addressing information matches the multicast group information stored in the multicast state table.

Description

BACKGROUND INFORMATION[0001]Internet Protocol (IP) multicast enables modern data networks to save bandwidth and processing capacity by reducing the number of copies of data packets transmitted from a source to a destination. In a traditional unicast model, source devices transmit content (e.g., a video file, etc.) directly to a destination device by referencing an IP address associated with the destination device. Therefore, even if multiple destination devices are requesting the same content at the same time, multiple copies of the content are transmitted simultaneously. While this model is effective for on-demand content-related activity, such as web browsing, it is inefficient for some types of media distributions, such as streaming video for IP television, distance learning, etc.[0002]Multicast operates in a manner more similar to a traditional broadcast model. Destination devices wishing to receive content from a particular source join a multicast group designated by a particul...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04J14/00
CPCH04L12/18H04Q11/0071H04Q11/0067
Inventor YADAV, RAJESH
Owner VERIZON PATENT & LICENSING INC
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